JetBlue Airways has finalised a firm order with Airbus for 40 medium-haul, single-aisle A320neo jets.

The A320neo jet features a choice of two new engines – the PurePower PW1100G from Pratt & Whitney or the LEAP-X from CFM International.

The fuel-efficient version of the aircraft is expected to enter into service in 2016.

JetBlue has also converted 30 of its pre-existing orders for A320s to the larger A321 model with enhanced wingtip devices called Sharklets.

In total, JetBlue has on order 40 A320neo aircraft, 30 A321s and 22 A320s.

The airline has not yet announced its engine selection for the A320neo order.